.NET: Generate SdkPackageVersions.props from version.py

Ensures that the versions always match the Godot version, albeit following
SemVer 2.0 so inserting a dot between "beta" and the build number.

For "stable" status, we omit the suffix as this would be interpreted as a
pre-release build too.

So we have:

| Godot version  | Nupkg version  |
| -------------- | -------------- |
| 4.0.0-beta     | 4.0.0-beta     |
| 4.0.0-beta2    | 4.0.0-beta.2   |
| 4.0.0-rc1      | 4.0.0-rc.1     |
| 4.0.0-stable   | 4.0.0          |

methods.py

@@ -7,15 +7,6 @@ from collections import OrderedDict
 from collections.abc import Mapping
 from typing import Iterator
 
-# We need to define our own `Action` method to control the verbosity of output
-# and whenever we need to run those commands in a subprocess on some platforms.
-from SCons import Node
-from SCons.Script import Action
-from SCons.Script import ARGUMENTS
-from SCons.Script import Glob
-from SCons.Variables.BoolVariable import _text2bool
-from platform_methods import run_in_subprocess
-
 
 def add_source_files(self, sources, files):
     # Convert string to list of absolute paths (including expanding wildcard)
@@ -220,6 +211,9 @@ def get_cmdline_bool(option, default):
     """We use `ARGUMENTS.get()` to check if options were manually overridden on the command line,
     and SCons' _text2bool helper to convert them to booleans, otherwise they're handled as strings.
     """
+    from SCons.Script import ARGUMENTS
+    from SCons.Variables.BoolVariable import _text2bool
+
     cmdline_val = ARGUMENTS.get(option)
     if cmdline_val is not None:
         return _text2bool(cmdline_val)
@@ -703,6 +697,9 @@ def generate_cpp_hint_file(filename):
 
 
 def glob_recursive(pattern, node="."):
+    from SCons import Node
+    from SCons.Script import Glob
+
     results = []
     for f in Glob(str(node) + "/*", source=True):
         if type(f) is Node.FS.Dir:
@@ -913,6 +910,9 @@ def CommandNoCache(env, target, sources, command, **args):
 
 
 def Run(env, function, short_message, subprocess=True):
+    from SCons.Script import Action
+    from platform_methods import run_in_subprocess
+
     output_print = short_message if not env["verbose"] else ""
     if not subprocess:
         return Action(function, output_print)