Implement '&&' and '||' operators on map

'-' is a valid character for tags.

Commit 03e1c7d (module/network: Add link stats, 2022-04-30) introduced
two new tags for the network module: `ul-speed` and `dl-speed`. These
use the `-` character, that was previously never used in any tag.

We had two options: either change those tags to use `_` instead, or just
accept `-`s as a valid character. Going forward, I can see many people
deciding to name their tags with `-` instead of `_`, so I believe it is
better to just accept it once and for all.

Note that `-` cannot be used as the first character of a tag (e.g.
`-tag1`) since the `-` has a special meaning in `.yml` files. I don't
believe this will happen often, however, and should be easy to both
detect and correct if it does.

particles/map.h

@@ -0,0 +1,37 @@
+#pragma once
+
+enum map_op {
+    MAP_OP_EQ,
+    MAP_OP_NE,
+    MAP_OP_LE,
+    MAP_OP_LT,
+    MAP_OP_GE,
+    MAP_OP_GT,
+    MAP_OP_SELF,
+    MAP_OP_NOT,
+
+    MAP_OP_AND,
+    MAP_OP_OR,
+};
+
+struct map_condition {
+    union {
+        char *tag;
+        struct map_condition *cond1;
+    };
+    enum map_op op;
+    union {
+        char *value;
+        struct map_condition *cond2;
+    };
+};
+
+void free_map_condition(struct map_condition *c);
+
+typedef struct yy_buffer_state* YY_BUFFER_STATE;
+YY_BUFFER_STATE yy_scan_string(const char *str);
+int yyparse();
+void yy_delete_buffer(YY_BUFFER_STATE buffer);
+
+extern struct map_condition *MAP_CONDITION_PARSE_RESULT;
+extern char *MAP_PARSER_ERROR_MSG;