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/Utils/Time.cpp

@@ -0,0 +1,80 @@
+#include "Time.hpp"
+
+#ifdef WIN32
+	#define WIN32_LEAN_AND_MEAN
+	#include <windows.h>
+	#undef WIN32_LEAN_AND_MEAN
+#endif /* WIN32 */
+
+namespace Slic3r {
+namespace Utils {
+
+time_t parse_time_ISO8601Z(const std::string &sdate)
+{
+	int y, M, d, h, m, s;
+	if (sscanf(sdate.c_str(), "%04d%02d%02dT%02d%02d%02dZ", &y, &M, &d, &h, &m, &s) != 6)
+        return (time_t)-1;
+	struct tm tms;
+    tms.tm_year = y - 1900;  // Year since 1900
+	tms.tm_mon  = M - 1;     // 0-11
+	tms.tm_mday = d;         // 1-31
+	tms.tm_hour = h;         // 0-23
+	tms.tm_min  = m;         // 0-59
+	tms.tm_sec  = s;         // 0-61 (0-60 in C++11)
+	return mktime(&tms);
+}
+
+std::string format_time_ISO8601Z(time_t time)
+{
+	struct tm tms;
+#ifdef WIN32
+	gmtime_s(&tms, &time);
+#else
+	gmtime_r(&time, &tms);
+#endif
+	char buf[128];
+	sprintf(buf, "%04d%02d%02dT%02d%02d%02dZ",
+    	tms.tm_year + 1900,
+		tms.tm_mon + 1,
+		tms.tm_mday,
+		tms.tm_hour,
+		tms.tm_min,
+		tms.tm_sec);
+	return buf;
+}
+
+std::string format_local_date_time(time_t time)
+{
+	struct tm tms;
+#ifdef WIN32
+	localtime_s(&tms, &time);
+#else
+	localtime_r(&time, &tms);
+#endif
+    char buf[80];
+ 	strftime(buf, 80, "%x %X", &tms);
+    return buf;
+}
+
+time_t get_current_time_utc()
+{
+#ifdef WIN32
+	SYSTEMTIME st;
+	::GetSystemTime(&st);
+	std::tm tm;
+	tm.tm_sec   = st.wSecond;
+	tm.tm_min   = st.wMinute;
+	tm.tm_hour  = st.wHour;
+	tm.tm_mday  = st.wDay;
+	tm.tm_mon   = st.wMonth - 1;
+	tm.tm_year  = st.wYear - 1900;
+	tm.tm_isdst = -1;
+	return mktime(&tm);
+#else
+	const time_t current_local = time(nullptr);
+	return mktime(gmtime(&current_local));
+#endif
+}
+
+}; // namespace Utils
+}; // namespace Slic3r