WL#8157: Remove deprecated GIS functions

Many GIS functions have several names. Most of these were deprecated by WL#8055. This WL is a followup from WL#8055 and WL#7541 that removes the deprecated function names. The actual functionality will still be present, but another function name with the "ST_" or "MBR" prefix must be used.

Functional requirements:

F-1: The following 67 functions MUST NOT exist:

     Area
     AsBinary
     AsText
     AsWKB
     AsWKT
     Buffer
     Centroid
     Contains
     ConvexHull
     Crosses
     Dimension
     Disjoint
     Distance
     EndPoint
     Envelope
     Equals
     ExteriorRing
     GeomCollFromText
     GeomCollFromWKB
     GeometryCollectionFromText
     GeometryCollectionFromWKB
     GeometryFromText
     GeometryFromWKB
     GeomFromText
     GeomFromWKB
     GeometryN
     GeometryType
     GLength
     InteriorRingN
     Intersects
     IsClosed
     IsEmpty
     IsSimple
     LineFromText
     LineFromWKB
     LineStringFromText
     LineStringFromWKB
     MBREqual
     MLineFromText
     MLineFromWKB
     MPointFromText
     MPointFromWKB
     MPolyFromText
     MPolyFromWKB
     MultiLineStringFromText
     MultiLineStringFromWKB
     MultiPointFromText
     MultiPointFromWKB
     MultiPolygonFromText
     MultiPolygonFromWKB
     NumGeometries
     NumInteriorRings
     NumPoints
     Overlaps
     PointFromText
     PointFromWKB
     PointN
     PolyFromText
     PolyFromWKB
     PolygonFromText
     PolygonFromWKB
     SRID
     StartPoint
     Touches
     Within
     X
     Y

Removal of deprecated functions
===============================

In WL#8055, a Create_func-wrapper was created for each function to be deprecated. These wrappers will now be removed, as well as the entry for the deprecated funtion in func_array[]. Since Contains() is handled directly by the parser, this function will be removed from sql_yacc.yy.

Test suite
==========

WL#8055 added a new test for ensuring that each deprecated function raised a warning. This test file will be removed, and any remaining usage of the removed functions will be changed to the ST_/MBR-prefixed version.