Symbol population now correctly uses relative path without the leading '/' which
was wrong since that signified absolute path. Also, relative paths are created
without allocating new strings. This saves plenty of string dups and possibly
some time during both population and queries.

Disable symbol search view for now (will be written differently),
Removed hide/unhide of globals view (it's now unnecessary with
the new globals view) and disable offline project scan (will be
re-enabled later).

Conflicts:
	plugins/symbol-db/symbol-db-engine-core.c