Fix typos with codespell

Using codespell 2.2-dev from current git.

Added `misc/scripts/codespell.sh` to make it easier to run it once in a
while and update the skip and ignore lists.

(cherry picked from commit 1bdb82c64e)

servers/visual_server.cpp

@@ -362,7 +362,7 @@ Vector2 VisualServer::norm_to_oct(const Vector3 v) {
 }
 
 // Maps normalized tangent vector to an octahedron projected onto the cartesian plane
-// Encodes the tangent vector sign in the second componenet of the returned Vector2 for use in shaders
+// Encodes the tangent vector sign in the second component of the returned Vector2 for use in shaders
 // high_precision specifies whether the encoding will be 32 bit (true) or 16 bit (false)
 // Resulting 2D vector in range [-1, 1]
 // See http://jcgt.org/published/0003/02/01/ for details