no-std support for monero-serai (#311)

* Move monero-serai from std to std-shims, where possible

* no-std fixes

* Make the HttpRpc its own feature, thiserror only on std

* Drop monero-rs's epee for a homegrown one

We only need it for a single function. While I tried jeffro's, it didn't work
out of the box, had three unimplemented!s, and is no where near viable for
no_std.

Fixes #182, though should be further tested.

* no-std monero-serai

* Allow base58-monero via git

* cargo fmt

Cargo.lock

@@ -529,6 +529,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d079cdf47e1ca75554200bb2f30bff5a5af16964cac4a566b18de9a5d48db2b"
 dependencies = [
  "thiserror",
+]
+
+[[package]]
+name = "base58-monero"
+version = "1.1.0"
+source = "git+https://github.com/monero-rs/base58-monero?rev=5045e8d2b817b3b6c1190661f504e879bc769c29#5045e8d2b817b3b6c1190661f504e879bc769c29"
+dependencies = [
  "tiny-keccak",
 ]
 
@@ -5086,7 +5093,7 @@ version = "0.17.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "403883d12972e916dd9754cdb90c25441a9abcf435f8e09c3146de100150eeb0"
 dependencies = [
- "base58-monero",
+ "base58-monero 1.0.0",
  "curve25519-dalek 3.2.0",
  "fixed-hash 0.7.0",
  "hex",
@@ -5098,16 +5105,6 @@ dependencies = [
  "tiny-keccak",
 ]
 
-[[package]]
-name = "monero-epee-bin-serde"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f8a3f7f7ef5bb1fd6c953be9187e48df8cc1a0ffc7d94f9fbabd4a23e37321e"
-dependencies = [
- "byteorder",
- "serde",
-]
-
 [[package]]
 name = "monero-generators"
 version = "0.3.0"
@@ -5145,7 +5142,7 @@ name = "monero-serai"
 version = "0.1.4-alpha"
 dependencies = [
  "async-trait",
- "base58-monero",
+ "base58-monero 1.1.0",
  "crc",
  "curve25519-dalek 3.2.0",
  "dalek-ff-group",
@@ -5157,7 +5154,6 @@ dependencies = [
  "hex",
  "hex-literal 0.4.1",
  "modular-frost",
- "monero-epee-bin-serde",
  "monero-generators",
  "monero-rpc",
  "multiexp",
@@ -8668,6 +8664,7 @@ dependencies = [
  "flexible-transcript",
  "minimal-ed448",
  "monero-generators",
+ "monero-serai",
  "multiexp",
  "schnorr-signatures",
 ]