"hollow" out `devsupMain.cpp`

[mdavidsaver]

I should be possible to replace all of the direct db* calls in devsupMain.cpp with indirect calls through _dbapi using the python interpreter. This would allow softIocPy* to be linked only with Com (and potentially not even than), so _dbapi to be linked "statically" without duplicate symbols, and the associated insanity.

@pheest fyi.

[pheest]

Hi Michael,
Reflecting on this, please don't make major changes on my account. My needs are met.
I would suggest making it illegal to build static, so that stoopid people like me don't make the same mistake.

I would also like to suggest that there is no need to write to a temporary file from the Python code since the text in the file is constant. This could just be a permanent file e.g. 'devsup.cmd' that is loaded into the database.