Implement option class inheritance

For now multiple, non-virtual inheritance is supported. An option class
can now also be declared abstract using the class c = 0 {...}; syntax.
New option, --exclude-base, controls whether base class information is
present in usage and documentation.

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/parser/test-001-common.cli b/tests/parser/test-001-common.cli
new file mode 100644
index 0000000..73fb928
--- /dev/null
+++ b/tests/parser/test-001-common.cli
@@ -0,0 +1 @@
+include "test-001-base.cli";