FS-7509: add userVariables parser to initial connection all variables set in this obj will be set on every inbound call

FS-7513: fix placement of overlay banner on letterbox callers change config option video-layout-bgcolor to video-letterbox-bgcolor

FS-7338: remove libsilk from tree, use system lib instead
FS-7338: change to always use system liblua
FS-7338: remove libbroadvoice from tree, use system lib instead
FS-7338: remove libilbc from tree, use system lib instead
FS-7338: remove libs using system libs from bootstrap
FS-7338: remove libg722_1 from tree, use system lib instead
FS-7338: remove mod_celt, it has be superseded by mod_opus
FS-7338: remove libcodec2 from tree, use system lib instead
FS-7338: remove libopus from tree, use system lib instead
FS-7338: remove libsoundtouch build from tree, use system lib instead
FS-7338: remove flite build from tree, use system lib instead
FS-7338: remove openldap build from tree, use system lib instead
FS-7338: remove libmongoc build from tree, use system lib instead
FS-7338: remove mod_mongo deps that are no longer actually required
FS-7338: remove some dup demo modules and don't include demo code in packages