fix original regular expression

* it only matched one single pari of `$$`, due to the leading `^` and trailing `$`
* it was greedy, thus the additional `?`
improve regular expression

* regular expression is improved and prepared for display math
* display math seems to be not possible inside TikZ/pgfplots
add new testcase `latexInterpreter`
join with previous testcase `latexmath1`

* adapt that test case to show clearer that `FontSize` is currently neglected
* use upright differential :-)
improve ordering of test cases
Merge remote-tracking branch 'PeterPablo/fix_448_display_math' into develop

Conflicts:
	test/suites/ACID.m
Extract `getXYAlignmentOfText` from `drawText`
Extract `getRotationOfText` from `drawText`
Extract `getPositionOfText` from `drawText`
DRY in `getPositionOfText`

Quite some code was duplicated, now this has been simplified to a single
call.
Extract `getColorOfMarkers` from `drawScatterPlot`

This DRYs `drawScatterPlot` a bit
Extract `add3DOptionsOfAxes` from `drawAxes`
Extract `surfaceOptsOf{Surf,Mesh}`
Extract `addStandalone` from `saveToFile`

This removes quite a lot of checks in favor of single
`switch-case`. Everything related to `standalone` is thus
contained within this single function.
Extract `setAxisTicks`
Move `{get,set}AxisTicks` near to `getAxisOptions`

Their only caller is `getAxisOptions`, so they should appear near each other.
Extract `setAxisLabel` from `getAxisOptions`
Extract `setAxisLimits` from `getAxisOptions`
Extract `getColorbarPosOptions`
Merge `{get,set}AxisTicks`