Python Linting and Code Formatting (#298)

* Create common print_diff function

* Add pylint and black

* Fix linting, move classes to utils

* Add black/pylint to github actions

* Fix linting

* Move Bin and SymInfo into their own files

* Split out format

* Tidy up workdlows and pip, add readme

* Lint tests, add tests to readme

tools/isledecomp/isledecomp/utils.py

@@ -0,0 +1,42 @@
+import os
+import sys
+import colorama
+
+
+def print_diff(udiff, plain):
+    has_diff = False
+    for line in udiff:
+        has_diff = True
+        color = ""
+        if line.startswith("++") or line.startswith("@@") or line.startswith("--"):
+            # Skip unneeded parts of the diff for the brief view
+            continue
+        # Work out color if we are printing color
+        if not plain:
+            if line.startswith("+"):
+                color = colorama.Fore.GREEN
+            elif line.startswith("-"):
+                color = colorama.Fore.RED
+        print(color + line)
+        # Reset color if we're printing in color
+        if not plain:
+            print(colorama.Style.RESET_ALL, end="")
+    return has_diff
+
+
+def get_file_in_script_dir(fn):
+    return os.path.join(os.path.dirname(os.path.abspath(sys.argv[0])), fn)
+
+
+class OffsetPlaceholderGenerator:
+    def __init__(self):
+        self.counter = 0
+        self.replacements = {}
+
+    def get(self, replace_addr):
+        if replace_addr in self.replacements:
+            return self.replacements[replace_addr]
+        self.counter += 1
+        replacement = f"<OFFSET{self.counter}>"
+        self.replacements[replace_addr] = replacement
+        return replacement