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Introduce separate config/data dirs (user & system wide)

This adds support for separate config and data dirs.

On Linux, these will be compliant XDG Basedir Specification, i.e.
XDG_CONFIG_HOME and XDG_CONFIG_DIRS (or XDG_DATA_HOME and XDG_DATA_DIRS
respectively). On all other platforms, there currently just set to the
homedir path (so no previous behaviour has been changed).

If reicast wants to read and write a data file, it just calls
get_data_path("/samplefile.txt"). If it does not need to write to
that file, it just uses get_data_path("/samplefile.txt", false). That
way, we can also use system-wide dirs (like /usr/share/reicast on
linux), that the user usually doesn't have write access to.

The same applies for config file, where you use get_config_path(args)
respectively.

sh4/mmu: Import the old mmu implementation from nullDC.

Added Ubuntu PPA for development version.

This coommit makes reicast use $XDG_CONFIG_HOME from XDG Base Directory
Specification[1] if possible.

For backwards-compatability with older installations, it checks if the
old-style config directory at $HOME/.reicast exists. If so, it'll use
that instead.

All new installation should use $XDG_CONFIG_HOME/reicast (or if
that environment variable is not set: $HOME/.config/reicast).

[1] http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html

Reicast doesn't support exceptions yet, so this isn't of much use now,
and is intended mostly as documentation. nullDC used some call stack
hooking magic to handle exceptions, which was never generic and clean
enough to be worth the effort to port to Reicast.

Update libpng to 1.6.18.

linux/Makefile: Fix regession caused by commit dc921249

Linux/Makefile: Add preliminary NAOMI support

linux/x11: Map X11 ESC key to exit emulator

Linux/Makefile: Readd .elf file ext and remove it during 'install' target

target

Improve man pages

makefiles: Add a generic linux 32-bit ARM rule.

Read evdev mappings from file

Appveyor: Deploy to S3

- Add S3 credentials, bucket reicast-builds-windows
- Don't split platform with - (win_x86 and win_x64, makes for easier regex)
- Naming consistent with current android builds naming

Until we have some decent way to load system wide files, users can
easily copy the mappings folder from /usr/share/reicast into ~/.reicast
to get the pre-defined mappings.