Allow disabling of new vector symbolization lines / areas

[waltweltonlair]

New vector symbolization lines and areas still have some stability issues, and we need to disable them by default. When the user defines layers using vector symbolization styles (e.g. using SetResource and providing a LayerDefinition-1.2.0 schema compliant XML document):

1) If there is line stylization, it will be ignored and the lines will render as solid black lines.

2) If there is area stylization, it will be ignored and the areas will render with a black border and empty (transparent) fill.

Since line styles were semi-supported in MapGuide 1.2 we provide a server configuration setting - EnableVectorSymbolizationLines - that lets you turn them back on. By default this setting is disabled.

Line / area styles will still be enabled in the debug configuration so that development can easily continue.

[waltweltonlair]

Implemented in trunk stream with submission 2954 (​https://trac.osgeo.org/mapguide/changeset/2954).

Implemented in branch stream with submission 2955 (​https://trac.osgeo.org/mapguide/changeset/2955).