Fix Conan 2.x build instructions in COMPILE.md

[Copilot]

The Conan build instructions used deprecated --install-folder flag and were missing required parameters, causing compilation failures on Linux and Windows.

Changes

Linux instructions (lines 38-49):

• --install-folder → --output-folder (Conan 2.x)
• Added -s build_type=RelWithDebInfo for correct dependency linking
• Added -DBUILDING_WITH_CONAN=ON CMake flag

Windows instructions (lines 160-170):

• --install-folder → --output-folder (Conan 2.x)
• Added -s build_type=Release for correct dependency linking
• Added -DBUILDING_WITH_CONAN=ON CMake flag

Corrected instructions

# Linux
conan install src/PlotJuggler --output-folder build/PlotJuggler \
      --build missing -pr:b=default -s build_type=RelWithDebInfo

cmake -S src/PlotJuggler -B build/PlotJuggler \
      -DCMAKE_TOOLCHAIN_FILE=$CMAKE_TOOLCHAIN \
      -DCMAKE_INSTALL_PREFIX=install \
      -DCMAKE_POLICY_DEFAULT_CMP0091=NEW \
      -DBUILDING_WITH_CONAN=ON

Aligns with existing conan_build.sh and CI workflow configurations.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[BUG]: Conan compile instructions for Linux are wrong</issue_title>
<issue_description>Describe the bug
The instructions as given in COMPILE.md are wrong.

PlotJuggler/COMPILE.md

Lines 38 to 48 in 1168247

	conan install src/PlotJuggler --install-folder build/PlotJuggler \
	--build missing -pr:b=default
	export CMAKE_TOOLCHAIN=$(pwd)/build/PlotJuggler/conan_toolchain.cmake
	cmake -S src/PlotJuggler -B build/PlotJuggler \
	-DCMAKE_TOOLCHAIN_FILE=$CMAKE_TOOLCHAIN \
	-DCMAKE_INSTALL_PREFIX=install \
	-DCMAKE_POLICY_DEFAULT_CMP0091=NEW
	cmake --build build/PlotJuggler --config RelWithDebInfo --target install

They don't work for two reasons:

1. --install-folder is not valid (also mentioned in Conan compile instructions for Windows are wrong #982), it should be --output-folder
2. conan install needs to know the config type, otherwise it does not link the dependencies correctly.

To Reproduce
Attempt to execute instructions are mentioned in COMPILE.md on a linux host.

Expected behavior
Compilation succeeds.

System details

• OS: Pop!_OS 24.04 LTS
• Platform: Linux
• Version: 1168247
• Conan version: 2.24.0

Additional context
Add any other context about the problem here.

The following build instructions (on Linux with Conan) work:

#!/bin/sh
conan install src/PlotJuggler --output-folder build/PlotJuggler \
      --build missing -pr:b=default -s build_type=RelWithDebInfo

export CMAKE_TOOLCHAIN=$(pwd)/build/PlotJuggler/conan_toolchain.cmake

cmake -S src/PlotJuggler -B build/PlotJuggler \
      -DCMAKE_TOOLCHAIN_FILE=$CMAKE_TOOLCHAIN  \
      -DCMAKE_INSTALL_PREFIX=install \
      -DCMAKE_POLICY_DEFAULT_CMP0091=NEW \
      -DBUILDING_WITH_CONAN=ON

cmake --build build/PlotJuggler --config RelWithDebInfo --target install -j14 
```</issue_description>

<agent_instructions>check the workflow configurations to see how conan is used correctly</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes [BUG]: Conan compile instructions for Linux are wrong #1252

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