add initial support for viewing variants in the sdk config tree. refactor some code which initializes sbsv2 contexts.
some hacks added for re-loading configurations when the default config is a variant.
bin.includes = .,\
META-INF/,\
icons/,\
plugin.xml,\
html/,\
Tools/,\
tocCodeScanner.xml,\
book.css,\
CodeScannerPlugin.jar,\
index/
jars.compile.order = CodeScannerPlugin.jar
source.CodeScannerPlugin.jar = src/
output.CodeScannerPlugin.jar = bin/