Include mserror.i and call msSetup() for PHP7 Swig mapscript

[bragef]

The default exception handling routines in mserror.i is missing if the only mapscript module defined is SWIGPHP7. This causes all mapscript errors to throw an uncathable 'E_ERROR' and quit php instead of throwing an exception.

[bragef]

Please ignore this for now; will do some more testing here.

[jmckenna]

roger, thanks @bragef

[bragef]

I think this should be safe to commit. I was a bit hesitant because I got a some exceptions which did not make sense after enabling the exeption handlers, e.g. the getMetaData methods trown an exception for a non-existent key. However, looking at the code this was more of a mis-feature than a bug. At any rate, it can be avoided by using acessing the hashObj instead. I also got a couple of exceptions because of a font initialisation bug (see below)

[bragef]

The PHP Swig mapscript was missing a call to msSetup(), so that the font cache was not properly initialized.

This causes labels to not appear on maps, or appear erratically. Without exceptions, I got a lot of errors of the type

[Wed Dec 11 13:59:21 2019].450696 msGetFontFace(): General error message. Freetype was unable to load font file "arial.ttf" for key "arial"

and with exceptions enabled mapscript threw an exeption when drawLabelCache() were called.

This is the same issue as is described in this thread:
http://osgeo-org.1560.x6.nabble.com/PHP-Mapscript-swig-issue-on-macOS-td5414228.html

[jmckenna]

I cannot reproduce the initial font errors reported, and still cannot. However your changes look valid. Merging...

[jmckenna]

thanks again @bragef !!