Changes

Update build configuration for RAP Tools 3.22.0 M3

- Use Eclipse Platform 4.25 I20220817-1800 (M3)
- Add missing bundles org.apache.commons.io and
  org.eclipse.e4.ui.progress as separate units to the build target
  platform.

Remove unmaintained `RAP Tools.launch`

The RAP Tools launch configuration had been in use internally in the
past, wasn't kept up to date and was never working on OS other than
Linux. Cleaning up and removing the outdated launch configuration.

Update build configuration for RAP Tools 3.22.0 RC1

- Use Eclipse Platform 4.25 I20220824-1800 (RC1)
- Replace Apache commons-io Orbit bundle with new
  org.apache.commons.commons-io bundle from Eclipse Platform (Maven
  Central).

Let Tycho p2 manage external dependencies

In earlier times the build dependencies to external bundles of Eclipse
Platform, Jetty, and license bundles was managed by a target definition
file as it is in use by Eclipse PDE. One problem of this approach is
that the RAP target definition relied on exact version specifications
which are painful to keep in sync, the new upcoming problem is the
strategy of Eclipse Platform to move away from coherent features to
bundles which leads to a mixture of bundle & feature installable units
in the RAP target definition.

Replace the target definition file in the build with p2 repository
location URLs as it is done in RAP Runtime since the beginning.

Use Tycho 2.7.5 to ensure that PGP signatures are mirrored

Bundle are using PGP now for ensuring their integrity instead of the
older MD5 and SHA1 checksums in p2. Upgrade to Tycho 2.7.5 that mirrors
already existing PGP signatures for external 3rd party bundles.

Update build configuration for RAP Tools 3.22.0 RC2

- Use Eclipse Platform 4.25 I20220831-1800 (RC2)

Update target definition files to 3.22 R

Use final release URL of Eclipse RAP + Platform