For make, stop using `iproj.json` for commands

[worksofliam]

For -bf make, we are using a custom property in iproj.json which allows users to overwrite commands parameters which would then be used as part of the generated makefile.

https://ibm.github.io/sourceorbit/#/./pages/cli/make?id=changing-compile-options

We need to stop doing this, and allow Source Orbit pick up all compile commands from the standard actions.json file.

This is so in the future, when we add a new build options, we are following a standard across Code for IBM i, makefile, and Source Orbit. The documentation will need to be updated.

[worksofliam]

Something to keep in mind for this issue is how commands are picked up, as Code for IBM i will be adding new logic to support multiple actions.json files: codefori/vscode-ibmi#2706

[edmundreinhardt]

iproj.json is the standard way for bob to pick up commands to build
and compile parameters are specified as variable assignments in Rules.mk

[worksofliam]

@edmundreinhardt This is not related to the build or compile properties.