configure.ac: disable maintainer mode in autogen.sh

It is very annoying when you edit configure.ac or a Makefile.am,
and running "make" does not automatically regenerate all affected
generated files.

https://bugzilla.gnome.org/show_bug.cgi?id=711673
configure.ac cleanups

This patch removes the following obsolete macros
- AM_PROG_CC_STDC (deprecated form of AC_PROG_CC)
- AC_ISC_POSIX (the INTERACTIVE UNIX that needed it is long dead)
- AC_C_CONST (assuming C89 support is safe today)
- AC_HEADER_STDC (unused, and assuming C89 support is safe today)

https://bugzilla.gnome.org/show_bug.cgi?id=711674
Remove the unused shave code

It was unused, and it was a hack for something that now has a proper
solution.
Use automake silent rules

This is the official way for what shave was a hack for.

automake 1.11 was released 4.5 years ago, so that version requirement
shouldn't be a problem.
Use autoreconf instead of custom steps in autogen.sh
build: silent C# compile rules too
configure: enable rebuild rules by default
Add missing entries to .gitignore

https://bugzilla.gnome.org/show_bug.cgi?id=711678
autogen: run intltoolize after autoreconf
Fix path with dates '/' for exported projects
Fix errors closing projects without anything recorded
Move remux step the ProjectsManager

Do the remuxing in the Services side instead of the GUI side.
This also helps on doing the remux when the capturer and the player
are closed and the output file is not opened and can be safely
moved for the remux in Windows
Add support for timers in tagging buttons
encoder: fix transcoding of VOB files

Add a check in the timeout to detect EOS or locks when the muxer
does not push the EOS event
Use a custom non linear editor instead of gnonlin
Handle video editor errors correctly
Rework tagger UI to make it fit better in the screen
encoder: set limits to queues in time for audio and video
Update video editor test utils
editor: fix segfault with long titles