Extensions loading (#795)

Signed-off-by: Roman <ixrock@gmail.com>

Co-authored-by: Alex Andreev <alex.andreev.email@gmail.com>
Co-authored-by: Lauri Nevala <lauri.nevala@gmail.com>

.gitignore

@@ -1,12 +1,14 @@
 dist/
-out/
 node_modules/
 .DS_Store
 yarn-error.log
 coverage/
 tmp/
-static/build/**
+static/build
+static/types
 binaries/client/
 binaries/server/
+src/extensions/*/*.js
+src/extensions/*/*.d.ts
 locales/**/**.js
 lens.log