LibCrypto: Move large functions to cpp file

If they use up so much stack space, contain (sometimes several) loops, and take
a noticable amount of time anyway, then 'inline' is probably going to be ignored
by the compiler anyway.

Libraries/LibCrypto/CMakeLists.txt

@@ -1,12 +1,13 @@
 set(SOURCES
-    BigInt/UnsignedBigInteger.cpp
     BigInt/SignedBigInteger.cpp
+    BigInt/UnsignedBigInteger.cpp
     Checksum/Adler32.cpp
     Checksum/CRC32.cpp
     Cipher/AES.cpp
     Hash/MD5.cpp
     Hash/SHA1.cpp
     Hash/SHA2.cpp
+    NumberTheory/ModularFunctions.cpp
     PK/RSA.cpp
 )