Update Eclipse Platform to 2021-06 & CDT to 10.3.0

Eclipse platform updated to 2021-06 and CDT updated to 10.3.

CDT has some improvements that can be viewed here:

https://wiki.eclipse.org/CDT/User/NewIn103

There are some nice new features such as the capability for headless build to remove projects from a workspace. Also a verbose mode has been added to headless build.

Some improvements have been made to the disassembly window. e.g. Jump to memory from disassembly.

The terminal view has received lots of updates and bug fixes.

Error marker and quickfix for missing toolchain version during build

When building a project, if the toolchain the project is using is not integrated or not enabled in e2 studio, an error marker will be generated and shown in Problems view.

Two quick fixes are provided for this error

* Open "Renesas Toolchain Management" preference page to add/enable more toolchains.

* Change toolchain version.