Use specific rules for lib folders in gitignore

Currently there is a git rule to ignore all `lib/` folders in the
project. But some sub-project might have lib folders that have to be
commited.

One solution would be to add exceptions to the `.gitignore` file as in
`!doc/lib/`. This would allow git to commit the "doc/lib/" folder, but
for this to work the exception has to be added after the excluding rule,
as in:

```
lib/
!doc/lib
```

If the exception comes before the rule, it is overruled. This is a
problem because the sorting rule applied to .gitignore files
automatically moves all exceptions (lines starting with "!") to the top
of the file.

To avoid this problem for the case of the "lib/" folders, this PR
replaces the `lib/` rule with more specific ones, so that no extra
exception rules for lib folders are necessary.

Signed-off-by: Rodrigo Pinto <rodrigo.pinto@calian.ca>

.gitignore

@@ -7,11 +7,13 @@
 *.tsbuildinfo
 .browser_modules/
 /.venv/
+/packages/base/lib/
 /packages/react-components/coverage/
+/packages/react-components/lib/
 TraceCompassTutorialTraces
 TraceCompassTutorialTraces.tgz
 examples/*
-lib/
 node_modules/
+theia-extensions/viewer-prototype/lib/
 trace-compass-server
 trace-compass-server.tar.gz