Add functions to return support status and version of the library

Created by: TomTheBear

Adds the following functions:

• likwid_getMajorVersion()
• likwid_getMinorVersion()
• likwid_getBugfixVersion()
• likwid_getNvidiaSupport()
• likwid_getMaxSupportedThreads()
• likwid_getMaxSupportedSockets()

See #428 and #430