Fix compatibility with Conan 2.x: (#5001)

Closes #4926, #4990

BUILD.md

@@ -36,9 +36,15 @@ See [System Requirements](https://xrpl.org/system-requirements.html).
 Building rippled generally requires git, Python, Conan, CMake, and a C++ compiler. Some guidance on setting up such a [C++ development environment can be found here](./docs/build/environment.md).
 
 - [Python 3.7](https://www.python.org/downloads/)
-- [Conan 1.55](https://conan.io/downloads.html)
+- [Conan 1.60](https://conan.io/downloads.html)[^1]
 - [CMake 3.16](https://cmake.org/download/)
 
+[^1]: It is possible to build with Conan 2.x,
+but the instructions are significantly different,
+which is why we are not recommending it yet.
+Notably, the `conan profile update` command is removed in 2.x.
+Profiles must be edited by hand.
+
 `rippled` is written in the C++20 dialect and includes the `<concepts>` header.
 The [minimum compiler versions][2] required are:
 
@@ -67,9 +73,6 @@ Here are [sample instructions for setting up a C++ development environment on ma
 Windows is not recommended for production use at this time.
 
 - Additionally, 32-bit Windows development is not supported.
-- Visual Studio 2022 is not yet supported.
-  - rippled generally requires [Boost][] 1.77, which Conan cannot build with VS 2022.
-  - Until rippled is updated for compatibility with later versions of Boost, Windows developers may need to use Visual Studio 2019.
 
 [Boost]: https://www.boost.org/
 
@@ -144,21 +147,30 @@ It does not explicitly link the C++ standard library,
 which allows you to statically link it with GCC, if you want.
 
    ```
+   # Conan 1.x
    conan export external/snappy snappy/1.1.10@
+   # Conan 2.x
+   conan export --version 1.1.10 external/snappy
    ```
 
 Export our [Conan recipe for RocksDB](./external/rocksdb).
 It does not override paths to dependencies when building with Visual Studio.
 
    ```
+   # Conan 1.x
    conan export external/rocksdb rocksdb/6.29.5@
+   # Conan 2.x
+   conan export --version 6.29.5 external/rocksdb
    ```
 
 Export our [Conan recipe for SOCI](./external/soci).
 It patches their CMake to correctly import its dependencies.
 
    ```
+   # Conan 1.x
    conan export external/soci soci/4.0.3@
+   # Conan 2.x
+   conan export --version 4.0.3 external/soci
    ```
 
 ### Build and Test
@@ -196,13 +208,13 @@ It patches their CMake to correctly import its dependencies.
     generated by the first. You can pass the build type on the command line with
     `--settings build_type=$BUILD_TYPE` or in the profile itself,
     under the section `[settings]` with the key `build_type`.
-    
+
     If you are using a Microsoft Visual C++ compiler,
     then you will need to ensure consistency between the `build_type` setting
     and the `compiler.runtime` setting.
-    
+
     When `build_type` is `Release`, `compiler.runtime` should be `MT`.
-    
+
     When `build_type` is `Debug`, `compiler.runtime` should be `MTd`.
 
     ```