Derive mapping of source to object from `OBJNAME.TYPE: srcname.srctype` so that we can support long source names and not require .pgm

[edmundreinhardt]

Right now the target object type is simply derived from a table lookup of the srctype
Instead we can scan all of the Rules.mk and build a dynamic table of source name to object names.

This will give flexibility to have long meaningful source names.
And program source will not REQUIRE .pgm.rpgle even though it is a good practice

[edmundreinhardt]

@irfanshar
For the log names, I recommend basing the log names on the target object complete with file extension/object type.
That is the correct mapping in any case.

[irfanshar]

@irfanshar For the log names, I recommend basing the log names on the target object complete with file extension/object type. That is the correct mapping in any case.

Sounds good. Although I'm not sure what the difference between this issue and #384.
Is this issue just more generic to include all bound programs?