Add support for loading Vi and CTags tag files

This allows to load tag files in the CTags format, which is compatible
with Vi format.

References:
 * http://ctags.sourceforge.net/FORMAT
 * http://ctags.sourceforge.net/ctags.html#TAG%20FILE%20FORMAT
Update of Lithuanian translation
Fix crash with bulk pattern replacements (introduced with c83a93e)

"regex_match_text" and "regex_matches" being globals, performing
several searches and then the replacements separately lead to them
having unexpected values, resulting in incorrect behavior and crash.

Fix this by removing the globals and instead make the search functions
return match details.  Not only this fixes the issue, but also make the
code a lot more maintainable by not having globals introducing side
effects (proof of them being an issue is that c83a93e inadvertently
broke things bad).
Don't try to set std_out and std_err if they are NULL
Cleanup statusbar template code a bit

* Unhardcode "pos" and "style" statusbar messages which were only
enabled when GEANY_DEBUG is defined and make them real possible
format chars.

* Move needless global "statusbar_template" into UIPrefs structure
with the other UI preferences, removing (now) pointless ui_finalize()
function.

* Rename "add_statusbar_statistics" to "create_statusbar_statistics"
and make it return a gchar* instead of passing in a GString argument
to update. Fixes a one-time "leak" of the GString and makes the code a
little easier to follow.

* Move the default statusbar template string to the top of the file
and use it as the default for the various preferences so the user has
something to base their customizations off of. TODO: check that the
N_() translations stuff works OK.
Improve Statusbar Template documentation

Mainly listing the available placeholders instead of pointing the
poor user deep into Geany's code.
Adding *.aux and *.bib as default (La)TeX file types
Merge branch 'master' of github.com:exbb2/geany