docs: added doxygen support and doxygen build scripts

docs/README

@@ -0,0 +1,4 @@
+You need doxygen and graphviz installed.
+
+Run the build-libs script first, then the project you're interested in. 
+HTMl will be generated and placed into docs/projectname.

docs/build-apmrover2.sh

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+#!/bin/bash
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+cd $DIR/..
+
+if [ ! -f docs/tags/libraries ]; 
+then
+	echo "Must build libraries first"
+	exit 0
+fi
+
+doxygen docs/config/apmrover2
+

docs/build-arducopter.sh

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+#!/bin/bash
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+cd $DIR/..
+
+if [ ! -f docs/tags/libraries ]; 
+then
+	echo "Must build libraries first"
+	exit 0
+fi
+
+doxygen docs/config/arducopter
+

docs/build-arduplane.sh

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+#!/bin/bash
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+cd $DIR/..
+
+if [ ! -f docs/tags/libraries ]; 
+then
+	echo "Must build libraries first"
+	exit 0
+fi
+
+doxygen docs/config/arduplane
+

docs/build-libs.sh

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+#!/bin/bash
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+cd $DIR/..
+doxygen docs/config/libraries

docs/config/apmrover2

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+@INCLUDE = docs/config/default
+
+INPUT = APMrover2/
+OUTPUT_DIRECTORY = docs/APMrover2
+HTML_OUTPUT = .
+TAGFILES = docs/tags/libraries=../libraries
+

docs/config/arducopter

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+@INCLUDE = docs/config/default
+
+INPUT = ArduCopter/
+OUTPUT_DIRECTORY = docs/ArduCopter
+HTML_OUTPUT = .
+TAGFILES = docs/tags/libraries=../libraries
+

docs/config/arduplane

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+@INCLUDE = docs/config/default
+
+INPUT = ArduPlane/
+OUTPUT_DIRECTORY = docs/ArduPlane
+HTML_OUTPUT = .
+TAGFILES = docs/tags/libraries=../libraries
+

docs/config/libraries

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+@INCLUDE = docs/config/default
+
+INPUT = libraries/
+OUTPUT_DIRECTORY = docs/libraries
+HTML_OUTPUT = .
+GENERATE_TAGFILE = docs/tags/libraries