doc: Various update
nmosh r7rs: Add expander hook
nmosh r7rs: Add "*.sld" as valid scheme library extension
doc: Add document a bit about R7RS
nmosh r7rs: Allow (srfi NUM) => (srfi :NUM) translation
nmosh r7rs: Prefer .sld over .scm for library file extension
SRFI-115: Import (chibi regexp)

FIXME: Replaced |\|| into \x7c;
nmosh r7rs: Implement (include ...) path handling
SRFI-33: Add subset of SRFI-33 which is enough to run (chibi regexp)

FIXME: Do we have to adopt this?
SRFI-69: Add SRFI-69 from reference implementation

FIXME: Re-implement this on R6RS hashtable later...
(chibi regexp): Remove char-set:title-case for now
(chibi regexp): Add (scheme char) library on import list