installer: Updated for TDM-GCC 4.8.1; Updated licenses

installer: Updated for TDM-GCC 4.8.1; Updated licenses
- Licenses were updated to more accurately reflect the licenses applying to the various MinGW-w64 components
- A new tab was added to the IDE/installer/licensing sample specifically for the MinGW-w64 runtime
- The GCC, GDB tab was updated to contain all licenses pertaining to the various TDM-GCC components
- The generic GPL license previously used for GCC/GDB was renamed to gpl2 and GPLv3 and LGPLv2/v3 were added as well
- TDM-GCC/MinGW-w64 licenses are no longer part of the optional documentation components (which were not
  installed by default) and are now always installed in Program Files/Ecere SDK/tdm/licenses
- Tabs were added to the licensing sample to reflect all acknowledgements required for the default Ecere dll