mipsevm: move test vectors, add readme specific to test-vectors, include license file

mipsevm/README

 Running MIPS processor on chain
 
-Tests from https://github.com/grantae/OpenMIPS/tree/master/software/test/macro/tests
-Licensed GPLv3
-Requires https://github.com/sergev/LiteBSD/releases/download/tools/gcc-4.8.1-mips-macosx.tgz to build
-
 Instruction set used by minigeth, 55 instructions:
 ['addi', 'addiu', 'addu', 'and', 'andi',
  'b', 'beq', 'beqz', 'bgez', 'bgtz', 'blez', 'bltz', 'bne', 'bnez',

mipsevm/evm_test.go

@@ -37,7 +37,7 @@ func testContractsSetup(t *testing.T) (*Contracts, *Addresses, *SourceMapTracer)
 }
 
 func TestEVM(t *testing.T) {
-	testFiles, err := os.ReadDir("test/bin")
+	testFiles, err := os.ReadDir("open_mips_tests/test/bin")
 	require.NoError(t, err)
 
 	contracts, addrs, tracer := testContractsSetup(t)
@@ -54,8 +54,9 @@ func TestEVM(t *testing.T) {
 			env.Config.Debug = false
 			env.Config.Tracer = tracer
 
-			fn := path.Join("test/bin", f.Name())
+			fn := path.Join("open_mips_tests/test/bin", f.Name())
 			programMem, err := os.ReadFile(fn)
+			require.NoError(t, err)
 			state := &State{PC: 0, NextPC: 4, Memory: NewMemory()}
 			err = state.Memory.SetMemoryRange(0, bytes.NewReader(programMem))
 			require.NoError(t, err, "load program into state")

mipsevm/open_mips_tests/LICENSE

+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
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+other than an Application or a Combined Work as defined below.
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mipsevm/open_mips_tests/README.md

+# OpenMIPS test vectors
+
+Tests from https://github.com/grantae/OpenMIPS/tree/d606b35e9d5260aef20de2a58660c8303a681e9c/software/test/macro/tests
+
+OpenMIPS is licensed LGPLv3 (as seen in the root of the repository), see [`LICENSE`](./LICENSE) file.
+Note that some build-system files from 2014/2015 in that repository by the same author are marked as BSD licensed,
+but the build-system is not used here.
+
+Requires https://github.com/sergev/LiteBSD/releases/download/tools/gcc-4.8.1-mips-macosx.tgz to build
+