Add multi-selection and gitignore for pycache

Remove LC_SINGLE_SEL to enable shift/ctrl selection, and ignore
__pycache__ and .pyc files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,2 @@
+__pycache__/
+*.pyc

plugins/component_table/__init__.py

@@ -11,7 +11,7 @@ class Sortable_Component_List(wx.ListCtrl, listmix.ColumnSorterMixin):
 	def __init__(self, parent):
 		wx.ListCtrl.__init__(
 			self, parent,
-			style=wx.LC_REPORT | wx.LC_HRULES | wx.LC_VRULES | wx.LC_SINGLE_SEL
+			style=wx.LC_REPORT | wx.LC_HRULES | wx.LC_VRULES
 		)
 		col_widths = [100, 120, 160, 200, 200]
 		for i, (col, w) in enumerate(zip(COLUMNS, col_widths)):