Add Spec for FlapperUniV2SwapOnly (WIP as well)

Makefile

@@ -1,2 +1,3 @@
 PATH := ~/.solc-select/artifacts/solc-0.8.16:~/.solc-select/artifacts/solc-0.5.12:~/.solc-select/artifacts/solc-0.5.16:~/.solc-select/artifacts/solc-0.4.18:~/.solc-select/artifacts:$(PATH)
-certora-flapper-univ2 :; PATH=${PATH} certoraRun certora/FlapperUniV2.conf$(if $(rule), --rule $(rule),)
+certora-flapper-univ2           :; PATH=${PATH} certoraRun certora/FlapperUniV2.conf$(if $(rule), --rule $(rule),)
+certora-flapper-univ2-swap-only :; PATH=${PATH} certoraRun certora/FlapperUniV2SwapOnly.conf$(if $(rule), --rule $(rule),) --cache none

certora/FlapperUniV2SwapOnly.conf

@@ -0,0 +1,63 @@
+{
+    "files": [
+        "src/FlapperUniV2SwapOnly.sol",
+        "certora/dss/Vat.sol",
+        "certora/dss/DaiJoin.sol",
+        "certora/dss/Dai.sol",
+        "certora/dss/DSToken.sol",
+        "certora/dss/SpotterMock.sol",
+        "certora/dss/PipMock.sol",
+        "certora/univ2/UniswapV2Pair.sol",
+        "certora/univ2/UniswapV2FactoryMock.sol"
+    ],
+    "link": [
+        "FlapperUniV2SwapOnly:vat=Vat",
+        "FlapperUniV2SwapOnly:daiJoin=DaiJoin",
+        "FlapperUniV2SwapOnly:dai=Dai",
+        "FlapperUniV2SwapOnly:gem=DSToken",
+        "FlapperUniV2SwapOnly:spotter=SpotterMock",
+        "FlapperUniV2SwapOnly:pip=PipMock",
+        "FlapperUniV2SwapOnly:pair=UniswapV2Pair",
+        "DaiJoin:vat=Vat",
+        "DaiJoin:dai=Dai",
+        "UniswapV2Pair:token0=Dai",
+        "UniswapV2Pair:token1=DSToken",
+        "UniswapV2Pair:factory=UniswapV2FactoryMock"
+    ],
+    "rule_sanity": "basic",
+    "solc_map": {
+        "FlapperUniV2SwapOnly": "solc-0.8.16",
+        "Vat": "solc-0.5.12",
+        "DaiJoin": "solc-0.5.12",
+        "Dai": "solc-0.5.12",
+        "DSToken": "solc-0.4.18",
+        "SpotterMock": "solc-0.8.16",
+        "PipMock": "solc-0.8.16",
+        "UniswapV2Pair": "solc-0.5.16",
+        "UniswapV2FactoryMock": "solc-0.8.16"
+    },
+    "solc_optimize_map": {
+        "FlapperUniV2SwapOnly": "200",
+        "Vat": "0",
+        "DaiJoin": "0",
+        "Dai": "0",
+        "DSToken": "200",
+        "SpotterMock": "0",
+        "PipMock": "0",
+        "UniswapV2Pair": "999999",
+        "UniswapV2FactoryMock": "0" 
+    },
+    "verify": "FlapperUniV2SwapOnly:certora/FlapperUniV2SwapOnly.spec",
+    "parametric_contracts": [
+        "FlapperUniV2SwapOnly"
+    ],
+    "prover_args": [
+        "-splitParallel true",
+        "-mediumTimeout 3600",
+        "-depth 30"
+    ],
+    "smt_timeout": "3600",
+    "optimistic_loop": true,
+    "multi_assert_check": true,
+    "wait_for_results": "all"
+}