Move all lua related files to lua/ subfolder

Also remove the lexers sub directory from the Lua search path.
As a result we attempt to open fewer files during startup:

 $ strace -e open -o log ./vis +q config.h && wc -l log

In order to avoid having to modifiy all lexers which `require('lexer')`
we instead place a symlink in the top level directory.

 $ ./configure --disable-lua
 $ rm -rf lua

Should result in a source tree with most lua specifc functionality
removed.

1 files changed, 14 insertions, 0 deletions

diff --git a/lua/doc/config.ld b/lua/doc/config.ld
new file mode 100644
index 0000000..a955b38
--- /dev/null
+++ b/lua/doc/config.ld
@@ -0,0 +1,14 @@
+-- Configuration file for Luadoc API generation
+project="Vis Editor"
+title="Vis Editor Lua API documentation"
+format="markdown"
+style="!fixed"
+dir="."
+sort=true
+merge=true
+no_space_before_args=true
+file={
+	"../../vis-lua.c",
+	"../vis.lua",
+}
+	
\ No newline at end of file