Removed artifical limiting of 7x4 display (LOL)

I needed more LOL'ing in my life, and a 7x4 segment display can help
with this.

However, adafruit_ht16k33 filters this out for the 7x4 display which
makes me super sad 😢.  This change allows the use of both upper and
lower case L's and O's.

(also, matrix.py and segments.py had the eXecutable bit set, which has
been dropped)

Fixes: #79
Signed-off-by: Dave Walker (Daviey) <[email protected]>

Author: Daviey

adafruit_ht16k33/matrix.py

@@ -373,6 +373,12 @@ def _put(self, char, index=0):
         elif char == ";":
             self._set_buffer(4, 0x00)
             return
+        elif char in "lL":
+            self._set_buffer(index, 0b00111000)
+            return
+        elif char in "oO":
+            self._set_buffer(index, 0b00111111)
+            return
         else:
             return
         self._set_buffer(index, NUMBERS[character])