renamed and moved 'start()' to  it's only call site -
as 'startsAsciiCaseInsensitive' lingucomponent/source/languageguessing/simpleguesser.cxx.
moved inline bool to it's only call site -
as 'isSeparator(const char)' from altstrfunc.hxx to lingucomponent/source/languageguessing/guess.cxx.

Change-Id: Ic624ba3cab90bd454311219966c19fb550388da1
Reviewed-on: https://gerrit.libreoffice.org/24864Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>