Fix projection matrix uniform for SHADER17

Signed-off-by: Harm Hanemaaijer <fgenfb@yahoo.com>
Work around shadow problem with compound objects

Work around problem with shadows in open wall (a compound object)
in demo1 when using shadow volumes by using seperate block
objects.

Correct function names in shadow.cpp.

Document some current known bugs in README.

Signed-off-by: Harm Hanemaaijer <fgenfb@yahoo.com>