style: Fix PEP8 blank lines issues in Python files

Done with `autopep8 --select=E3,W3`, fixes:

- E301 - Add missing blank line.
- E302 - Add missing 2 blank lines.
- E303 - Remove extra blank lines.
- E304 - Remove blank line following function decorator.
- E309 - Add missing blank line.
- W391 - Remove trailing blank lines.

SConstruct

@@ -85,7 +85,6 @@ env_base.use_ptrcall = False
 env_base.split_drivers = False
 
 
-
 env_base.__class__.android_add_maven_repository = methods.android_add_maven_repository
 env_base.__class__.android_add_dependency = methods.android_add_dependency
 env_base.__class__.android_add_java_dir = methods.android_add_java_dir
@@ -199,7 +198,6 @@ elif env_base['p'] != "":
     env_base["platform"] = selected_platform
 
 
-
 if selected_platform in platform_list:
 
     sys.path.append("./platform/" + selected_platform)
@@ -298,7 +296,6 @@ if selected_platform in platform_list:
     sys.path.remove("./platform/" + selected_platform)
     sys.modules.pop('detect')
 
-
     env.module_list = []
 
     for x in module_list:
@@ -314,7 +311,6 @@ if selected_platform in platform_list:
         sys.path.remove(tmppath)
         sys.modules.pop('config')
 
-
     if (env.use_ptrcall):
         env.Append(CPPFLAGS=['-DPTRCALL_ENABLED']);
 
@@ -371,7 +367,6 @@ if selected_platform in platform_list:
         # has a purpose.
         # env['MSVS_VERSION']='9.0'
 
-
         # Calls a CMD with /C(lose) and /V(delayed environment variable expansion) options.
         # And runs vcvarsall bat for the propper arhitecture and scons for propper configuration
         env['MSVSBUILDCOM'] = 'cmd /V /C set "plat=$(PlatformTarget)" ^& (if "$(PlatformTarget)"=="x64" (set "plat=x86_amd64")) ^& set "tools=yes" ^& (if "$(Configuration)"=="release" (set "tools=no")) ^& call "$(VCInstallDir)vcvarsall.bat" !plat! ^& scons platform=windows target=$(Configuration) tools=!tools! -j2'