Improve variable and function naming conventions across Python and C++ codebase

[Copilot]

Refactored variable and function names to improve code clarity and maintainability without changing functionality.

Changes by file

Python scripts (logger.py, evaluation.py)

• Single-letter variables → descriptive names (T → transform_matrix, pc → point_cloud, gt → ground_truth, traj → trajectory)
• Fixed typo: calc_picth_distribution → calc_pitch_distribution

C++ preprocessing (preprocess.h, preprocess.cpp)

• Point cloud members: pl_surf → point_cloud_surface, pl_corn → point_cloud_corner, pl_buff → point_cloud_buffer, typess → point_types
• Threshold variables: disA/disB → distance_threshold_A/distance_threshold_B, p2l_ratio → point_to_line_ratio, edgea/edgeb → edge_threshold_a/edge_threshold_b
• Function parameters: pl → point_cloud

C++ voxel mapping (voxelMapping.cpp)

• Feature variables: feats_undistort → features_undistorted, feats_down_body → features_downsampled_body, normvec → normal_vectors
• Counters: iterCount → iteration_count, effct_feat_num → effective_feature_num

Build config

• Added __pycache__ and *.pyc to .gitignore

Example

# Before
def calc_picth_distribution(pc_origin):
    x = pc_origin[:, 0]
    y = pc_origin[:, 1]
    z = pc_origin[:, 2]
    
# After
def calc_pitch_distribution(point_cloud_origin):
    x_coords = point_cloud_origin[:, 0]
    y_coords = point_cloud_origin[:, 1]
    z_coords = point_cloud_origin[:, 2]

// Before
PointCloudXYZI pl_surf, pl_corn, pl_buff[128];
double disA, disB, p2l_ratio;

// After
PointCloudXYZI point_cloud_surface, point_cloud_corner, point_cloud_buffer[128];
double distance_threshold_A, distance_threshold_B, point_to_line_ratio;

Original prompt

Suggest more descriptive variable and function names

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