strict effects (#18777)

* fixes #17369
* megatest is green for --cpu:arm64
* docgen output includes more tags/raises
* implemented 'effectsOf' 
* algorithm.nim: uses new effectsOf annotation
* closes #18376
* closes #17475
* closes #13905
* allow effectsOf: [a, b]
* added a test case
* parameters that are not ours cannot be declared as .effectsOf
* documentation
* manual: added the 'sort' example
* bootstrap with the new better options

tests/effects/tstrict_effects_sort.nim

@@ -0,0 +1,27 @@
+discard """
+  errormsg: "cmpE can raise an unlisted exception: Exception"
+  line: 27
+"""
+
+{.push warningAsError[Effect]: on.}
+
+{.experimental: "strictEffects".}
+
+import algorithm
+
+type
+  MyInt = distinct int
+
+var toSort = @[MyInt 1, MyInt 2, MyInt 3]
+
+proc cmpN(a, b: MyInt): int =
+  cmp(a.int, b.int)
+
+proc harmless {.raises: [].} =
+  toSort.sort cmpN
+
+proc cmpE(a, b: MyInt): int {.raises: [Exception].} =
+  cmp(a.int, b.int)
+
+proc harmfull {.raises: [].} =
+  toSort.sort cmpE