uLxLy bridgeAsset scenarios

	A	B	C	D	E	F	G
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3		bridgeAsset, where asset is	Lx gas_token is	Lx checks (internal stuff in bridgeAsset)	Ly gas_token is	Ly checks (internal stuff in claimAsset)	claimAsset transfers (aka what destination receives)
4	A1	gas token (eth)	Lx_gas_token==eth	token info is null	Ly_gas_token == Lx_gas_token	weth is null	gas token (eth)
5	A2	ERC20		token info is erc 20 info	Ly_gas_token == Lx_gas_token	token info is not null, and not gas token	ERC20
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7	A3	gas token (eth)		token info is null	Ly_gas_token != Lx_gas_token	weth is not null	Ly.WETH
8	A4	ERC20		token info is erc 20 info	Ly_gas_token != Lx_gas_token, and erc20!=Ly_gas_token	token info is not null, and not gas token	ERC20
9	A5	ERC20		token info is erc 20 info	Ly_gas_token != Lx_gas_token, but erc20==Ly_gas_token	token info is not null, and it's gas token	gas token (not eth)
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11	B1	gas token (not eth)	Lx_gas_token!=eth	token info is gas token	Ly_gas_token == Lx_gas_token	token info is not null, and is gas token	gas token (not eth)
12	B2	Lx.WETH		token info null, Lx.WETH burned		token info is null, Ly.WETH exists	Ly.WETH
13	B3	ERC20		token info is erc 20 info		token info is not null, and not gas token	ERC20
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15	B4	gas token (not eth)		token info is gas token	Ly_gas_token != Lx_gas_token	token info is not null, and not gas token	ERC20
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17	B5	Lx.WETH		token info null, Lx.WETH burned	Ly_gas_token != Lx_gas_token, but Ly_gas_token == eth	token info is null, Ly.WETH null	gas token (eth)
18	B6	Lx.WETH		token info null, Lx.WETH burned	Ly_gas_token != Lx_gas_token, and Ly_gas_token != eth	token info is null, Ly.WETH exists	Ly.WETH
19	B7	ERC20		token info is erc 20 info	Ly_gas_token != Lx_gas_token, and erc20!=Ly_gas_token	token info is not null, and not gas token	ERC20
20	B8	ERC20		token info is erc 20 info	Ly_gas_token != Lx_gas_token, but erc20==Ly_gas_token	token info is not null, and it's gas token	gas token (not eth)
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24		NOTE: not yet vetted by JL, but wrote tests against this spec https://github.com/omnifient/lxly-bridge-and-call/blob/main/test/integration/BridgeWithDifferentAssetTypes.t.sol
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