changes to build plugin outside of opencpn source tree
fixes to correctly install and find the data files
move unused file out of data because it bloats the package
Merge remote-tracking branch 'upstream/wmm' into wmm

Conflicts:
	src/wmm_pi.h
update cmake files
add nsis template
wx-3.0 fixes
fix compiler warnings and report warnings in log file
fix c linkage
fixes for wx-2.8
fix rendering to work with opengles, simplify and improve performance
bump version and update packaging for arm
Merge pull request #3 from seandepagnier/wmm

make wmm build outside of tree for packaging