[FEATURE] Added v.extrude GRASS module Note: also added r.stats in a previous commit

Author: pcav

src/plugins/grass/modules/v.extrude.attr.qgm

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE qgisgrassmodule SYSTEM "http://mrcc.com/qgisgrassmodule.dtd">
+
+<qgisgrassmodule label="Extrudes flat vector object to 3D with height based on attribute" module="v.extrude">
+	<option key="input" layeroption="layer"/>
+	<option key="elevation" label="Elevation raster for height extraction (optional)"/>
+	<option key="zshift" advanced="yes" />
+        <field key="hcolumn" layer="input" type="integer,double" />
+        <option key="output"/>
+</qgisgrassmodule>

src/plugins/grass/modules/v.extrude.fixed.qgm

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE qgisgrassmodule SYSTEM "http://mrcc.com/qgisgrassmodule.dtd">
+
+<qgisgrassmodule label="Extrudes flat vector object to 3D with fixed height" module="v.extrude">
+	<option key="input" layeroption="layer"/>
+	<option key="elevation" label="Elevation raster for height extraction (optional)"/>
+	<option key="zshift" advanced="yes" />
+        <option key="height" />
+        <option key="output"/>
+</qgisgrassmodule>