Feature/handle rotated text

[fallscameron01]

closes #77

Handle Text Detection at Different Orientations

Note: The solution implemented is a brute force method and may be slow.

Changes

• Added rotate_points() function to BoundingBox class to rotate the points of the box around a center point.
• Added rotate_text_img() function to rotate image containg the text by a certain angle.
• Fixed text detection at angles using brute force method of iteratively rotating the image and running text characteristics algorithms.
• Added multi_rot_text_img() function to implement brute force solution. Image is rotated 10 degrees at each step by default and runs text characteristics algorithms. If text character, orientation, and color are found, return immediately. Stops after image is rotated 360 degrees without finding characteristics.

[fallscameron01]

closes #83

New Changes

• Added filter_characters() function to remap uncommon characters
• Added parameter to multi_rot_text_img() to toggle filtering of uncommon characters