Implement support for sourcing .cli files

The idea is that the file is "read in" as if its content was copy-n-pasted.
For example:

"\h|Installation|"
source "INSTALL.cli" // Also used to generate plain text INSTALL.

Unlike include, source can appear anywhere in the file.

1 files changed, 1 insertions, 1 deletions

diff --git a/cli/lexer.hxx b/cli/lexer.hxx
index 710090d..830860c 100644
--- a/cli/lexer.hxx
+++ b/cli/lexer.hxx
@@ -131,7 +131,7 @@ private:
   keyword_map keyword_map_;
 
   bool eos_;
-  bool include_;
+  bool include_; // Literal in include or source.
   bool valid_;
 
   xchar buf_;