WASM Python integration milestone - game.py runs in browser

Major milestone for issue #158 (Emscripten/WebAssembly build target):
- Python 3.14 successfully initializes and runs in WASM
- mcrfpy module loads and works correctly
- Game scripts execute with full level generation
- Entities (boulders, rats, cyclops, spawn points) placed correctly

Key changes:
- CMakeLists.txt: Add 2MB stack, Emscripten link options, preload files
- platform.h: Add WASM-specific implementations for executable paths
- HeadlessTypes.h: Make Texture/Font/Sound stubs return success
- CommandLineParser.cpp: Guard filesystem operations for WASM
- McRFPy_API.cpp: Add WASM path configuration, debug output
- game.py: Make 'code' module import optional (not available in WASM)
- wasm_stdlib/: Add minimal Python stdlib for WASM (~4MB)

Build with: emmake make (from build-emscripten/)
Test with: node mcrogueface.js

Next steps:
- Integrate VRSFML for actual WebGL rendering
- Create HTML page to host WASM build
- Test in actual browsers

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

wasm_stdlib/lib/python3.14/encodings/uu_codec.py

@@ -0,0 +1,103 @@
+"""Python 'uu_codec' Codec - UU content transfer encoding.
+
+This codec de/encodes from bytes to bytes.
+
+Written by Marc-Andre Lemburg (mal@lemburg.com). Some details were
+adapted from uu.py which was written by Lance Ellinghouse and
+modified by Jack Jansen and Fredrik Lundh.
+"""
+
+import codecs
+import binascii
+from io import BytesIO
+
+### Codec APIs
+
+def uu_encode(input, errors='strict', filename='<data>', mode=0o666):
+    assert errors == 'strict'
+    infile = BytesIO(input)
+    outfile = BytesIO()
+    read = infile.read
+    write = outfile.write
+
+    # Remove newline chars from filename
+    filename = filename.replace('\n','\\n')
+    filename = filename.replace('\r','\\r')
+
+    # Encode
+    write(('begin %o %s\n' % (mode & 0o777, filename)).encode('ascii'))
+    chunk = read(45)
+    while chunk:
+        write(binascii.b2a_uu(chunk))
+        chunk = read(45)
+    write(b' \nend\n')
+
+    return (outfile.getvalue(), len(input))
+
+def uu_decode(input, errors='strict'):
+    assert errors == 'strict'
+    infile = BytesIO(input)
+    outfile = BytesIO()
+    readline = infile.readline
+    write = outfile.write
+
+    # Find start of encoded data
+    while 1:
+        s = readline()
+        if not s:
+            raise ValueError('Missing "begin" line in input data')
+        if s[:5] == b'begin':
+            break
+
+    # Decode
+    while True:
+        s = readline()
+        if not s or s == b'end\n':
+            break
+        try:
+            data = binascii.a2b_uu(s)
+        except binascii.Error as v:
+            # Workaround for broken uuencoders by /Fredrik Lundh
+            nbytes = (((s[0]-32) & 63) * 4 + 5) // 3
+            data = binascii.a2b_uu(s[:nbytes])
+            #sys.stderr.write("Warning: %s\n" % str(v))
+        write(data)
+    if not s:
+        raise ValueError('Truncated input data')
+
+    return (outfile.getvalue(), len(input))
+
+class Codec(codecs.Codec):
+    def encode(self, input, errors='strict'):
+        return uu_encode(input, errors)
+
+    def decode(self, input, errors='strict'):
+        return uu_decode(input, errors)
+
+class IncrementalEncoder(codecs.IncrementalEncoder):
+    def encode(self, input, final=False):
+        return uu_encode(input, self.errors)[0]
+
+class IncrementalDecoder(codecs.IncrementalDecoder):
+    def decode(self, input, final=False):
+        return uu_decode(input, self.errors)[0]
+
+class StreamWriter(Codec, codecs.StreamWriter):
+    charbuffertype = bytes
+
+class StreamReader(Codec, codecs.StreamReader):
+    charbuffertype = bytes
+
+### encodings module API
+
+def getregentry():
+    return codecs.CodecInfo(
+        name='uu',
+        encode=uu_encode,
+        decode=uu_decode,
+        incrementalencoder=IncrementalEncoder,
+        incrementaldecoder=IncrementalDecoder,
+        streamreader=StreamReader,
+        streamwriter=StreamWriter,
+        _is_text_encoding=False,
+    )