This new API allows for different SPM implementations, using a function
pointer table like that used for MPM.
This change also switches over the paths that make use of
DetectContentData (which previously used BoyerMoore directly) to the new
API.
Whenever DETECT_CONTENT_NOCASE is set for a BoyerMoore matcher, the
function BoyerMooreCtxToNocase() must be called. This call was missing
in AppLayerProtoDetectPMRegisterPattern().
Also created BoyerMooreNocaseCtxInit() that calls BoyerMooreCtxToNocase()
to make some code cleaner and safer.
Rather than converting the search string to lower case while searching,
convert it to lowercase during initialization.
Changes the Boyer Moore search API for take BmCtx
Change the API for BoyerMoore to take a BmCtx rather than the two parts that
are stored in the context. Which is how it is mostly used. This enforces
always calling BoyerMooreCtxToNocase() to convert to no-case.
Use CtxInit and CtxDeinit functions to create and destroy the context,
even in unit tests.