xpAddCoverage cmake function

[smanders]

the xpAddCoverage() cmake function, which is currently in

• https://isrhub.usurf.usu.edu/Vantage/CommonLibraries/blob/85c8f0a2c0f741887ba9cac2644cb3a0180680a9/cmake/toplevel.cmake#L95-L180
• https://isrhub.usurf.usu.edu/VantagePlugins/PluginLibraries/blob/814e4b1316c066900488c1a44cb31a1fc8f3fceb/cmake/toplevel.cmake#L18-L103
• https://isrhub.usurf.usu.edu/SWAT/SWATFramework/blob/ad368c0dc0dccbc00bb85710f3fa63c86f95bb6d/cmake/toplevel.cmake#L9-L94

should be moved to externpro's xpfunmac.cmake https://github.com/smanders/externpro/blob/23.02/modules/xpfunmac.cmake

[smanders]

there appears to have been a change to xpAddCoverage() in CommonLibraries https://isrhub.usurf.usu.edu/Vantage/CommonLibraries/commit/b9b1508812705cbdbd8f77d05345f3afe55c86c9#diff-a45d44cef2d61552139a8303db2315c8ddf37b14fb59f76972d02cd39b8fdd5b that was copied into PluginLibraries (CommonLibraries and PluginLibraries match), but the same change wasn't made in SWATFramework

[smanders]

completed with commit referenced above and commits in xpro branches of [Common|Plugin]Libraries and SWATFramework