WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/slic3r/GUI/AppConfig.hpp

@@ -0,0 +1,140 @@
+#ifndef slic3r_AppConfig_hpp_
+#define slic3r_AppConfig_hpp_
+
+#include <set>
+#include <map>
+#include <string>
+
+#include "libslic3r/Config.hpp"
+#include "slic3r/Utils/Semver.hpp"
+
+namespace Slic3r {
+
+class AppConfig
+{
+public:
+	AppConfig() :
+		m_dirty(false),
+		m_orig_version(Semver::invalid()),
+		m_legacy_datadir(false)
+	{
+		this->reset();
+	}
+
+	// Clear and reset to defaults.
+	void 			   	reset();
+	// Override missing or keys with their defaults.
+	void 			   	set_defaults();
+
+	// Load the slic3r.ini from a user profile directory (or a datadir, if configured).
+	void 			   	load();
+	// Store the slic3r.ini into a user profile directory (or a datadir, if configured).
+	void 			   	save();
+
+	// Does this config need to be saved?
+	bool 				dirty() const { return m_dirty; }
+
+	// Const accessor, it will return false if a section or a key does not exist.
+	bool get(const std::string &section, const std::string &key, std::string &value) const
+	{
+		value.clear();
+		auto it = m_storage.find(section);
+		if (it == m_storage.end())
+			return false;
+		auto it2 = it->second.find(key);
+		if (it2 == it->second.end()) 
+			return false;
+		value = it2->second;
+		return true;
+	}
+	std::string 		get(const std::string &section, const std::string &key) const
+		{ std::string value; this->get(section, key, value); return value; }
+	std::string 		get(const std::string &key) const
+		{ std::string value; this->get("", key, value); return value; }
+	void			    set(const std::string &section, const std::string &key, const std::string &value)
+	{ 
+		std::string &old = m_storage[section][key];
+		if (old != value) {
+			old = value;
+			m_dirty = true;
+		}
+	}
+	void			    set(const std::string &key, const std::string &value)
+		{ this->set("", key, value);  }
+	bool				has(const std::string &section, const std::string &key) const
+	{
+		auto it = m_storage.find(section);
+		if (it == m_storage.end())
+			return false;
+		auto it2 = it->second.find(key);
+		return it2 != it->second.end() && ! it2->second.empty();
+	}
+	bool				has(const std::string &key) const
+		{ return this->has("", key); }
+
+	void				erase(const std::string &section, const std::string &key)
+	{
+		auto it = m_storage.find(section);
+		if (it != m_storage.end()) {
+			it->second.erase(key);
+		}
+	}
+
+	void 				clear_section(const std::string &section)
+		{ m_storage[section].clear(); }
+
+	typedef std::map<std::string, std::map<std::string, std::set<std::string>>> VendorMap;
+	bool                get_variant(const std::string &vendor, const std::string &model, const std::string &variant) const;
+	void                set_variant(const std::string &vendor, const std::string &model, const std::string &variant, bool enable);
+	void                set_vendors(const AppConfig &from);
+	void 				set_vendors(const VendorMap &vendors) { m_vendors = vendors; m_dirty = true; }
+	void 				set_vendors(VendorMap &&vendors) { m_vendors = std::move(vendors); m_dirty = true; }
+	const VendorMap&    vendors() const { return m_vendors; }
+
+	// return recent/skein_directory or recent/config_directory or empty string.
+	std::string 		get_last_dir() const;
+	void 				update_config_dir(const std::string &dir);
+	void 				update_skein_dir(const std::string &dir);
+
+	std::string 		get_last_output_dir(const std::string &alt) const;
+	void                update_last_output_dir(const std::string &dir);
+
+	// reset the current print / filament / printer selections, so that 
+	// the  PresetBundle::load_selections(const AppConfig &config) call will select
+	// the first non-default preset when called.
+    void                reset_selections();
+
+	// Get the default config path from Slic3r::data_dir().
+	static std::string  config_path();
+
+	// Returns true if the user's data directory comes from before Slic3r 1.40.0 (no updating)
+	bool legacy_datadir() const { return m_legacy_datadir; }
+	void set_legacy_datadir(bool value) { m_legacy_datadir = value; }
+
+	// Get the Slic3r version check url.
+	// This returns a hardcoded string unless it is overriden by "version_check_url" in the ini file.
+	std::string version_check_url() const;
+
+	// Returns the original Slic3r version found in the ini file before it was overwritten
+	// by the current version
+	Semver orig_version() const { return m_orig_version; }
+
+	// Does the config file exist?
+	static bool 		exists();
+
+private:
+	// Map of section, name -> value
+	std::map<std::string, std::map<std::string, std::string>> 	m_storage;
+	// Map of enabled vendors / models / variants
+	VendorMap                                                   m_vendors;
+	// Has any value been modified since the config.ini has been last saved or loaded?
+	bool														m_dirty;
+	// Original version found in the ini file before it was overwritten
+	Semver                                                      m_orig_version;
+	// Whether the existing version is before system profiles & configuration updating
+	bool                                                        m_legacy_datadir;
+};
+
+}; // namespace Slic3r
+
+#endif /* slic3r_AppConfig_hpp_ */