refactor: rename plugins to lowercase to adhere to naming conventions

Author: yuriverweij

utest/test/api/approved_files/PluginDocumentation.test_many_plugins.approved.txt

@@ -528,18 +528,18 @@ Example project for translation can be found from
 [https://github.com/MarketSquare/robotframework-seleniumlibrary-translation-fi | robotframework-seleniumlibrary-translation-fi]
 repository.
 
-= Plugin: MyLib =
+= Plugin: my_lib =
 
 Some dummy documentation.
 
-= MyLib Heading 1 =
+= my_lib Heading 1 =
 
 This is heading 1 documentation.
 
-== MyLib Heading 2 ==
+== my_lib Heading 2 ==
 
  This is heading 2 documentation.
 
-= Plugin: MyLibArgs =
+= Plugin: my_lib_args =
 
 No plugin documentation found.

utest/test/api/test_plugin_keyword_tags.py

@@ -3,8 +3,8 @@
 
 from SeleniumLibrary import SeleniumLibrary
 
-from .my_lib import MyLib
-from .my_lib_args import MyLibArgs
+from .my_lib import my_lib
+from .my_lib_args import my_lib_args
 
 
 class PluginKeywordTags(unittest.TestCase):
@@ -21,12 +21,12 @@ def test_no_plugin(self):
 
     def test_store_plugin_keywords(self):
         sl = SeleniumLibrary()
-        sl._store_plugin_keywords(MyLib("0"))
+        sl._store_plugin_keywords(my_lib("0"))
         assert sl._plugin_keywords == ["bar", "foo"]
 
     def test_store_plugin_keywords_with_args(self):
         sl = SeleniumLibrary()
-        sl._store_plugin_keywords(MyLibArgs("000", "111", "222"))
+        sl._store_plugin_keywords(my_lib_args("000", "111", "222"))
         assert sl._plugin_keywords == ["add_cookie", "bar_2", "foo_1"]
 
     def test_tags_in_plugin(self):