Remove unnecessary swearing.
dependency_collector: use ArgumentError exception.

Avoids errors with `brew versions` when bottling.

References #27615.
Upgraded to Pebble SDK 2.0.2.

- added pypng resource
- modified pebble-arm-toolchain resource to the precompiled one given by Pebble
- removed the dependency from virtualenv
Removed unutilized dipendencies
Fixed Pillow compile error.
Revert to building pebble-arm-toolchain from sources.
Revert "Revert to building pebble-arm-toolchain from sources."

This reverts commit 14b12b004d052ad611265424f25efa0fc302ec09.
Added dependency macos >= mountain_lion
Compile Pebble SDK toolchain from sources
Fixed some dependencies to be compile time only.
ENV improvements.
Revert "ENV improvements."

This reverts commit ddf6a677a11c53ad2a6ad102bb0e044e97b28da9.
Documentation fix
Fixed trailing whitespace
pebble-sdk: add 2.0.2 bottle.