Python bindings: Fix editable install + Execute Python2.7 workflow tests (#2044)

* Python binding:
- Added missing `license` field in pyproject.toml file
- Fixed editable mode install and some more code cleanup in setup.py
- Refreshed README.md
- Replaced f-string formatter in tests with `format` method in order to be py2-compatible
- Fixed typos
- PEP8 fixes

* GitHub Action: Install Python2.7 and run tests for re-tagged wheels on native arch runners only

* Python bindings:
- Use #x formatter to format hex values

bindings/python/tests/test_arm64.py

@@ -87,7 +87,8 @@ def test_arm64_read_sctlr():
 
 def test_arm64_hook_mrs():
     def _hook_mrs(uc, reg, cp_reg, _):
-        print(f">>> Hook MRS instruction: reg = 0x{reg:x}(UC_ARM64_REG_X2) cp_reg = {cp_reg}")
+        print(">>> Hook MRS instruction: reg = {reg:#x}(UC_ARM64_REG_X2) cp_reg = {cp_reg}".format(reg=reg,
+                                                                                                   cp_reg=cp_reg))
         uc.reg_write(reg, 0x114514)
         print(">>> Write 0x114514 to X")
 
@@ -111,7 +112,7 @@ def test_arm64_hook_mrs():
         # Start emulation
         mu.emu_start(0x1000, 0x1000 + len(ARM64_MRS_CODE))
 
-        print(f">>> X2 = {mu.reg_read(UC_ARM64_REG_X2):x}")
+        print(">>> X2 = {reg:#x}".format(reg=mu.reg_read(UC_ARM64_REG_X2)))
 
     except UcError as e:
         print("ERROR: %s" % e)