Add cmake include guard against double inclusion of toolchain file

Seems that cmake sometimes includes the toolchain file twice when
reads existing cache. This prevents that.
Fix comment typo
Add LinuxDrone logo artwork
Add favicon.ico for web sites and eGCS (tm)
Add favicon.ico to eGCS folder
Update favicon.ico to contain 16x16, 32x32, 48x48 sizes
Install favicon.ico into webapp
Merge remote-tracking branch 'origin/chernikov/gcs' into integration
Merge remote-tracking branch 'origin/os/artwork' into integration
CMutex: add named mutex
CModule: add write/read BSON object to shared memory
Merge commit 'integration' into voha/fwsdk
Merge branch 'voha/fwsdk' of ssh://git.linuxdrone.org/LinuxDrone into vrubel/gcs-bootstrap
LD-20 Template of meta for new type modules (including blocks)