Installation strategy changes. Preparation for Debian packaging.

Now installs into the install prefix specified by cmake. SO versions added.
Migrate from boost::regex to boost::xpressive
Installation strategy change

CMake now installs ${CMAKE_INSTALL_PREFIX}/bin/glxosd[-platformsuffix]
Refactor GLXOSD codebase to be modular; naming is now camelCase

- Refactor sensor data providers into their own files and shared
libraries: This makes it possible to compile Debian packages with
hardware-specific sensor support by implementing it as a "plugin" shared
library.

- Refactor configuration file parsing out of OSDInstance: OSDInstance
should not be responsible for reading and storing config data.

- Allow custom configuration options(might result in a very small
performance decrease): instead of storing the configuration in a struct,
we now store it in a map. This means that configuration option lookup is
now logarithmic, but it should have little to no effect because the number
of lookups and elements is negligibly small and you shouldn't worry about
this change at all.

- Change the launcher to dynamically build LD_LIBRARY_PATH and LD_PRELOAD.

- CamelCase is now used as the main convention for GLXOSD (but not
glinject). Sorry, I just find snake_case harder to read.
Rewrite the module system to do dynamic loading manually

This fixes crashes involving missing configuration files on some systems
by preventing multiple copies of the same library being loaded. glinject
now uses GLINJECT_CONSTRUCTORS and GLINJECT_DESTRUCTORS environment
variables to determine what to execute. GLXOSD now reads the
GLXOSD_PLUGINS environment variable to determine which plugins to load.
Stop the same plugin from being loaded multiple times

A little bash script modification. This removes duplicate entries from
the GLXOSD_PLUGINS environment variable.
Fix last commit (escape variable calls in launcher template)
Fix uniqueness check in launcher

Fixes segfaults in 32 bit systems.
Change README to reflect dependency changes and fix formatting