feat: add various detector.

- add endian and compiler detector, and modify os detector.
- now we use CMake to add detector-used macro, instead of using some C++ features to detect them.
- change Windows environment detection according to the change of os detector.

doc/src/library_macros.dox

@@ -73,7 +73,7 @@ Assume \c blabla() function is Windows specific.
 We have following example code:
 
 \code
-#if YYCC_OS == YYCC_OS_WINDOWS
+#if defined(YYCC_OS_WINDOWS)
 blabla();
 #endif
 \endcode