Add markdown plugin files

1. new PathResolve class
2. add markdown plugin files
Add plugin framework
Merge branch 'master' into plugins
Fix build issue
Add plugin dialog and use XDG spec setting path
build on osx
add hellworld plugin template
Merge branch 'master' into plugins

Conflicts:
	i18n/wiznote_zh_CN.ts
	i18n/wiznote_zh_TW.ts
clean up makefile
Merge branch 'plugins'

Conflicts:
	src/wizLoginDialog.cpp