* help_plugin: Fix looking up symbolic linked man pages in gz or bz2 files (bug #19155)

The problem happened because the man file stored the path without specifying
the extension of the target man file on disk. This commit adds check if the
linked file exists and if it doesn't then it checks if there is a gz or bz2
file with the same name. It such file exists it loads it.
* editor: recognize more stl headers as C++ for syntax highlighting
* file properties: count statistics language independantly
* changed all wx30 project files NOT to use PCH to make them compilable with TDM GCC 4.8.1
* changed all wx30_64 files to use WX30_64 global var to be able to have different wxWidgets sources for 32 and 64 bit
* added missing wx30_64 project files and workspaces
* changed build scripts to clearly show whats being compiled in the window bar
* remove now obsolete wx29 project files, scripts etc. wx30 should be the standard now and is as feature-complete as wx29