Added permutations and ranges to test defines

This is really more work for the bench runner. With this change defines
can be manipulated at a rather high level at runtime. Which should be
useful for generating benchmarks across various dimensions.

The define grammar in the test_runner is now a bit more powerful,
accepting:

1. A single value: -DN=42
2. A list of values, which get permuted: -DN=1,2,3
3. A range: -DN=range(10)
4. Some combo: -DN=1,2,range(3,0,-1)

This is more complex in the test .toml defines, which can also be C
expressions:

1. A single value: define=42
2. A single expression: define='42*42'
3. A list: define=[1,2,3]
4. A comma separated string: define='1,2,3'
5. A range: define='42*range(10)'
6. This mess: define=[1,2,'3,4,range(2)*range(2)+3']

tests/test_move.toml

@@ -1586,7 +1586,7 @@ code = '''
 # move fix in relocation
 [cases.move_fix_relocation]
 in = "lfs.c"
-defines.RELOCATIONS = [0x0, 0x1, 0x2, 0x3]
+defines.RELOCATIONS = 'range(4)'
 defines.ERASE_CYCLES = 0xffffffff
 code = '''
     lfs_t lfs;
@@ -1731,7 +1731,7 @@ code = '''
 # move fix in relocation with predecessor
 [cases.move_fix_relocation_predecessor]
 in = "lfs.c"
-defines.RELOCATIONS = [0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7]
+defines.RELOCATIONS = 'range(8)'
 defines.ERASE_CYCLES = 0xffffffff
 code = '''
     lfs_t lfs;