Add quotes around project and solution paths to fix error

[DuncanMT]

Fix for issue #37 .

Added quotes around project and solution paths in build_command_generator.rb.

Bumped version to 0.11.1.

Tested terminal output with space in path at 'projects/Fastlane Test/src' :

+---------------------+-------------------------------------------------------------------------------+
|                                      Summary for souyuz 0.11.1                                      |
+---------------------+-------------------------------------------------------------------------------+
| build_configuration | Release                                                                       |
| platform            | android                                                                       |
| build_platform      | AnyCPU                                                                        |
| solution_path       | /Users/duncan/projects/Fastlane Test/FastlaneTest.sln                         |
| project_name        | FastlaneTest.Droid                                                            |
| project_path        | /Users/duncan/projects/Fastlane                                               |
|                     | Test/src/FastlaneTest.Droid/FastlaneTest.Droid.csproj                         |
| output_path         | /Users/duncan/projects/Fastlane Test/src/FastlaneTest.Droid/bin/Release/      |
| manifest_path       | /Users/duncan/projects/Fastlane                                               |
|                     | Test/src/FastlaneTest.Droid/Properties/AndroidManifest.xml                    |
| buildtools_path     | /Users/duncan/Library/Developer/Xamarin/android-sdk-macosx/build-tools/30.0.2 |
| assembly_name       | com.<company>.fastlanetest                                                    |
| silent              | false                                                                         |
| compiler_bin        | msbuild                                                                       |
| build_target        | ["Build"]                                                                     |
| keystore_tsa        | http://timestamp.digicert.com                                                 |
+---------------------+-------------------------------------------------------------------------------+

[14:45:06]: $  msbuild -p:Configuration=Release -p:SolutionDir="/Users/duncan/projects/Fastlane Test/" -t:Build -t:SignAndroidPackage "/Users/duncan/projects/Fastlane Test/src/FastlaneTest.Droid/FastlaneTest.Droid.csproj"
[14:45:08]: ▸
Microsoft (R) Build Engine version 16.9.0 for Mono
[14:45:08]: ▸ Copyright (C) Microsoft Corporation. All rights reserved.
^[[64;15R[14:45:08]: ▸ Build started 09/02/2022 14:45:08.