Fix and refactor drawOnMinimap (resolves #39, #192)

This MR fixes drawOnMinimap to respect the current advances in minimap drawing technology.

A refactor was made to remove almost all of the hard-coded cruft from it, extracting the flags- and position-related code used in the actual minimap code into functions to be used in drawOnMinimap, for simplification and ease of maintenance.

Test script (by Togen, draws a dot on your position every so often): DL_MapTrails-vbad.lua

Before:

After:

There's an open question of how the Lua API should function if the progression bar is active. Should there be an exposed func for progression bar mode, which would then put the onus on the user? Or should it return early and prevent all attempts at plonking items on there?

Otherwise plusone

resolved all threads

added Lua label

merged

mentioned in commit 2bc5fcc0