replace Fusion CanvasTools with OpenLayers vector handling equivalents

[madair]

OpenLayers provides very good tools for vector rendering and handling now so the Fusion CanvasTools? and widgets that use them should be replaced by the equivalent functionality from OpenLayers

[madair]

(In [1736]) re #200: conversion of Select and Measure tools; remove CanvasTools? and RectTools? from Fusion core load

[madair]

(In [1737]) re #200: convert MapGuideViewerApi?.js to use OpenLayers.Layer.Vector and DrawFeature? controls; includes a patch to OL so that regular polygon handler can be style similar to point,path and polygon handlers

[madair]

initial implementation complete, issues to be reported as separate tickets

[pagameba]

(In [1816]) re #200, remove inheritance from Canvas.Tool as it causes a javascript error.

[pagameba]

(In [1817]) re #200, remove unnecessary CanvasTool? base class.