Changed wrong translation of identantion

In portuguese, there is no "endentação", but "indentação".
Updated last translator
Don't prompt for reload from infobar when there are no unsaved changes

Also warn about losing undo history when there are no changes.
Don't rebuild TagManager workspace tags when quitting

Updating the workspace is useless as the application will be shut down,
and not doing it can save a lot of time (almost 50% speedup quitting an
instance with all Geany source from `src/` open).
Query GdkWindow reference only if available

On startup, the Geany main window doesn't have a GdkWindow yet
(probably because it is not yet mapped). This causes many
'gdkdrawable-win32.c:2013 drawable is not a pixmap or window'
warnings when resolving shortcuts on Windows.
Since we pass the SLR_NO_UI to the Windows API, we probably
don't need the parent hWnd reference at all.
Prepare Windows installer for embedded GTK 2.24
Fix moving editor tabs through keybindings
Add note about -D_FILE_OFFSET_BITS=64
Explicitly list symbols to dynamically export

Uses a Python script to generate a listing used by the linker to
determine which symbols to dynamically export. This provides finer
grained control of which symbols are dynamically exported, limiting
only to the ones needed for GtkBuilder signal connections.

The build system integration could probably be done a little cleaner.
Mark all plugin API functions to have "default" (public) visibility

Adds a new header `pluginexport.h` to put the macros in, could be
moved into an existing header (support.h?) by I didn't want to drag
a bunch of existing stuff into the source files for this one macro.

TagManager has relative include, this could be fixed by changing the
include directories for it if it's a problem. Mark the Scintilla
functions exported by re-declaring them in sciwrappers.c with the
attribute to avoid changing upstream Scintilla code.
Change to GEANY_EXPORT_SYMBOL for callback functions

This allows them to be dynamically exported when -fvisibility=hidden
is applied.

TODO: remove the CFLAGS hack in configure.ac
Remove redundant GEANY_EXPORT_SYMBOL usage in callbacks.h

It only needs to be specified in one place for each function.
Remove struct/macro/funcptr linkage control for plugin API

Add rest of headers needed for declarations of all public API
functions. Add HAVE_PLUGINS define to geanyplugins.h since some headers
need this and it should always be valid for this header.
geanyfunctions.h left for source-level backwards compatibility for
plugins which might `#include` this header directly. I don't know why
they do it, but some Geany-Plugins do this.
Move Geany's core into a library (libgeany)

This will allow plugins to link against the core when accessing API
functions, now that the macro/struct/funcptr stuff is gone.

Also convert the helper libraries into Libtool helper libraries as
linking a shared library against static libraries is (apparently) not
portable.
Improve Autotools build system for libgeany

Checks if the compiler supports -fvisibility and the linker supports
-dynamic-list arguments and use them instead of hardcoding. The new
geany-lib.m4 also accomodates future use of Libtool versioning.
Replace dynamic exports with codegen for GtkBuilder callbacks

This prevents having to export those callbacks and put them in the
global namespace. Also, use inline shell script in Makefile.am instead
of a Python script which should be more portable (by default) and gets
rid of the helper script.
Don't export GtkBuilder callbacks anymore

They are connected inside the library now rather than using GModule to
find the symbols. Mark local callback handlers as static since they
aren't global or exported anymore, they should be static. Since they're
static now, all of the forward-declarations of the functions local to
callbacks.c are pointless, so just remove them.