TCI - Update target to 2021-03 release

Update target files to use:
- 2021-03
- 4.19
- emfforms 1.26

All dependencies to equinox.ds and felix.scr needed to be removed,
as they are not exported anymore.

Change-Id: I351ed34c095859059a190f49d1a09f44afc5b8bc
Signed-off-by: Eugen Neufeld <eneufeld@eclipsesource.com>