Revert "development: TRDS 3.0 and new theme engine preparation (2/4)"

This reverts commit 9ee100c261a6636020bf8e4e363226af07f5bcde.
Allow importing of settings into eclipse

Eclipse XML format seems to have changed. Importing silently failed before this fix.

Change-Id: I15d951a8fde5b57268da92b1351c2c7d8252b111
development: TRDS 3.0 and new theme engine preparation sdk support (3/4)

First commit for public api sdk support, to give app developer a way
to add TRDS/TRLS and coming theme engine support. As well would be later
used for themer to build theming.

Of course apps will be still compatible to firmwares without that feature
as well backwardscompatible

This just adds the support

TODO:
- Proper API documentation
- Adding sample cases

Change-Id: I58cff01d573d38e19ebba509bd0fc9b18b8193fe