global refactoring: use libunwind to get stack frame, get rid on process

base address, better DWARF DW_OP_XXX handling, initial implementation of
parameter's values retrieval

framework/common.h

@@ -0,0 +1,13 @@
+#pragma once
+
+
+typedef struct __dwarf_op_map {
+	int				op_num;		// DWARF Operation DW_OP_XXX
+	int				regno;		// platform-dependent register number if present
+	const char*		regname;	// register name if regno specified
+	const char* 	op_name;	// string representation of an operation
+} dwarf_op_map;
+
+const dwarf_op_map* find_op_map(int op);
+int32_t decode_sleb128(uint8_t *sleb128);
+uint32_t decode_uleb128(uint8_t *uleb128);